Continuity logging using differenced signal detection

Details Continuity logging using differenced signal detection Continuity logging using differenced signal detection

G - Physics

01

V

349/3, 349/4

G01V 1/42 (2006.01)

Patent

CA 2018421

A method of determining the continuity of a lithographic layer located between two vertical boreholes is disclosed. A seismic source is lowered in the first borehole while simultaneously a receiver pair, preferably a pair of "vertical" geophones spaced apart by about two feet, are lowered in the second borehole to develop a "differenced signal". The recording of high amplitude signals within a layer is an indication of a continuous, low velocity layer. The middle of a layer can also be discovered using a single vertical receiver and finding the place of phase reversal.

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